Let me propose that tertium non datur is always a fallacy: Non tantum tertium sed quartum et quintum. ("Not only third, but fourth and fifth.") There always are many alternatives. We only fail to see them, or perhaps don't want to see them. But they always exist. And finding them is the only way to go.

Actually, this phrase is one of the bases of Western logic (and I mean logic as a branch of philosophy). It appeared first in 'De Logica', the Latin translation of Aristotle's 'Peri Logikes', or in English: 'On Logic'. And indeed it refers only to logic. This phrase was never used by Aristotle, or any other philospher, in any other context, neither moral nor any other.

This was a phrase coined by the Alchemist Dictum and often quoted by C.G. Jung. I must state that to the contrary there is a third option. It merely states that the 'third is not given' not that it doesn't exist. This is quite simply because it is for each of us to find individually. It is also not given because it is one of the great guarded secrets of Gnosticism. You give a lot of examples of the philosophy of duality. There are two ends of every spectrum, yes! But there is also a third position that is not given, it must be sought. This is triangle of completeness, the Holy Trinity, the center of the scale, the balance. It is literally the center point of all spectrum's. That which exist there, is the closest definition of God that can conceived. To attain this balance, is to become God-like, to achieve Gnosis!